auto trans C6 vs. FMX vs. C4

[Kcode351]

I pulled a 351w and auto trans from a 76 Cougar. I always thought it was a C4. I had the torque converter reworked to get some stall, but never ran it. Recently, I gave the trans to a friend. He said, the shop told him it was a FX, and would be difficult to mate with a late 5.0. I'm assuming he meant a FMX. Now, its back on the floor of my garage. After a year, the 351w now has several mods. Could some one give me comments on C6 vs FMX for performance and durability on a weekend driver.

[Clark Rodgers]

I have the FMX and the major drawback is weight and this transmission is harder to setup correctly when rebuilt. I like the durability of mine but if I had to change it I would go with a C4 or AOD, the C6 is hard to find and expensive to rebuild.

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69 351W Sportsroof deluxe

I would go with the C4. They are very lightweight and are strong enough for applications up to about 400 hp. Very good for quick accelerations around town...

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'69 Coupe with 351W
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Edelbrock Performer-RPM highrise dual plane intake manifold, Edelbrock Performer-RPM hydraulic cam (224 int duration, 234 exh; .496 int lift, .520 exh, and it idles just fine), Edelbrock Performer 750 cfm 4-barrel carb, Accel coil, Moroso Blue-Max plug wires, Hedman headers, 2.5" pipe, dual Thrush glasspacks, Edelbrock Performer-Link timing chain, C4 with B&M Street/Strip Shift Kit, Lakewood traction bars, 3.55's, 3200 lbs...
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[Dark Knight]

here is a pic of my old FMX...'nuff said ;-)

or if that didnt work, it's here http://www.inficad.com/~darkknight/Brktran.jpg

[Clark Rodgers]

Dark, usually that happens after someone rebuilds it that doesn't know what there doing. It's hard to find anyone that has alot of experience with these beasts, but mine has over 110k and still barks the tires in second

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69 351W Sportsroof deluxe